Dental operating device



Jam 13, 1925.

w. L. THIEDEMANN DENTAL OPERATING DEVICE Filed Jan. 9, 1922 .ill

fvw'm'dw Y JM Patented dan. 13, 1925.

itil

WILLAM L. TH'EDEMANN, OF lVISKEC-XGN, lVCHGAN, ASSIGNGR- TO THLEDEMANN- HARDY COMPANY, F MUSKEGON, lVIICHIGN, COPARTNERSHP COMPRISING WILLIAM L. THIEDEMANN AND HAZLETT IVI. HARDY.

DENTAL PERATNG DEVCE.

Application le. January 9, 1922.

To all fio/wm it may concern:

Be it known that I, V/'ILLIAM L. Trimon- MANN, a citizen of the UnitedStates, residing at Muskegon, in the county oit' Muskegon and State ot' Michigan, have invented certain new and useful Improvements in Dental Operating Bevices, of which the following is a specilication.

This invention relates to dental apparatus but more particularly to operating pieces 'for use with dental engines and has for its primary object to provide a simple, sanitary and etlicient device of this type.

These pieces are used by dentists to operate within the mouth ot a patient and the very nature of their use renders them exceed ingly unsanitary unless frequently and thoroughly cleaned. Dentists rarely clean more than the outside of these devices because of the time required in the taking apart and the assembly. The piece soon becomes filled with filth and grit which is conducted from mouth to mouth. r)The grit in this deposit produces a constant grinding of the parts which very materially shortens the lite of the device.

l have provided an operating piece which is simple in construction and may be almost instantly taken apart or assembled without the aid ot any tools. rl`he disassembled parts may be quickly and easily cleaned, sterilized and oiled in a thorough manner.

The many other objects and advantages or' my improved operating piece will be better understood by reference to the following specification when considered in connection with the accompanying drawing illustrating selected embodiments thereof in which Fig. 1 is a central vertical section of an operating piece embodying my invention.

Fig. 2 is an enlarged top plan view of the outer end portion of the piece shown in Fig. 1.

Fig. 3 is an enlarged section on the line 3 3 ot Fig. 1.

Figs. 4, 5 and 6 are respectively enlarged transverse sections on the lines 1-*4, .f3-5, and 6-6 of Fig. 1, and

Fig. 7 is a central vertical section ol" a portion of a modiiied Jform of handpiece. if Referring to the drawing, the operating piece comprises a handpiece 10. a tool holder 11 and a slip joint connection 12. The slip Serial No. 527,922.

joint connection is of a well-known type and needs no description as it forms no part or the present invention. rThe particular type of handpiece illustrated in the drawing has a grip 18 of hard rubber or other suitable substance provided with an axial bore 141 in which operates the spindle 15. rllhis spindle 15 is driven from the usual flexible shafting (not shown) through the medium of the slip joint connection 12. driving dog 1T is screwed upon the rear end ot this spindle to engage a coresponding dog 18 on the connecting shaft 16. Metal terrules 19 and 20 iit over the front and rear ends respectively ot' the grip 13 and :from bearings for the spindle 15. The slip joint connection 12 slides within the sleeve portion 21 ot the errule 2O and is adapted to he retained therein by the spring latch 22 engaging a notch in the sleeve. F his sleeve is provided with the usual open ended slot 22 to admit the end portion of the latch 22.

A head 28 is formed upon the iiront end of the errule 19 and the tool holder 11 slidably lits over the iree end ot this head. A spring latch 2e on thc tool holder 11 is adapted to engage a laterally projecting pin on the head 23 to securely attach the holder on the head. i pin 26 in the head 23 projects into a slot 27 in the holder 11 to prevent relative rotation. la rotary member 29 operates in the axial bore 28 otl the head 23.

The spindle 15 is provided at its front end with a socket 30 which is square in cross section or ot a form other' than round to receive and iit the correspondingly shaped rear end oi." the member 29 and torni a driving connection between these parts. A head 31 is formed on the front end ot the member 29 and this head is provided with a square socket to receive and engage a knob 32 on the inner end of a shaft The knob 32 is square in cross sectional area but the Jraces are curved longitudinally to provide an angular' driving connection between the shaft 83 and the member 29.

A sleeve 34 lits within the bore of the tool holder 10 and forms a. bearing tor the shaft 33. A star wheel 35 and a collar 3G are secured upon the shaft 33 at opposite ends of the sleeve 311 and act to position the shaft Within this sleeve. rEhe outer portion of the tool holder 11 is provided with a transverse bore 3? Within which the tool holding sleeve 38 operates. rfhis sleeve 1s provided With spaced collars 39 and 40 which fit Within the bore and form bearings for the sleeve. ylhe collar 39 forms a shoulder to engage the opposing shoulder 4l produced by the contraction of the bore 37. The bur or other operating tool 42 its Within the sleeve 58 and is prevented from relative rotation therein by the usual contraction 43 at the upper end of the sleeve. A star Wheel 44 is formed on the sleeve 38 to mesh With the wheel 35 on the shaft 33 to cause this sleeve to he rotated by the spindle l5.

Oppositely disposed guides 45 are formed on the rear face of the. holder ll near its outer end and a tool locking member 46 op,` erates in these guides. This member 44 is preferably made of spring metal and carries a lateral flange 47 which projects over the end of the holder and is adapted to form a closure for the opening 48 in this end Wall. The function of this opening 48 is to permit the Withdrawal of the sleeve 34 and parts` carried thereby. The member 46 forms a closure for the upper end of the bore 37 and i-s provided With a slot 49 which is adapted to admit and engage the upper end of the tool 42 to lock this tool Wit-hin the holder. A spring finger 50 on the member presses against the upper face of the holder and provides a frictional resistance to movement of this member in its guides.

Assuming that the parts are in their a"- sembled position, as indicated in F l, the operating piece is disassembled in the fol-A lowing manner -Insert the linger nail under the flange 47 and draw this flange away from the head as far as the slot 49 will permit. This brings the upper end or head of the tool into registration with the circular enlargement 5.) at the end of this slot and permits the tool to be Withdrawn trom the holder' in the usual manner. The member 4o may now be Wholly withdrawn from the guides 45. The Withdrawal of the member 46 permits the sleeve 3S to be removed by inverting the holder and slightly tapping it if necessary. rlChe sleeve 34 With shaft 38 and parts carried thereby may now be removed by depressing the end of the holder and permitting this sleeve to drop through the opening 48. The holder is next detached from the handpiece by lifting the inner end of the latch 24 with the linger nail sutliciently to'release this latch from the pin and permit the holder to be ufithdrawn from the head 23. rThe detachment ofthe holder 1l permits the shaft 29 to be removed. The slip joint connect-ion l2 is disengaged by releasing the latch 29. and Withdraiving the connection from the sleeve 2l. yThis permits the spindle l5 to be Withdrawn Vfrom the rear end of. the handpiece, The assembly of the operating piece is merely.

the converse of the disassembly and equally simple. When completely disassembled in the manner described the parts Y may be quickly and easily cleaned, sterilized and individually given a coating of lubricating oil.

rllie tool holder hereinbefore described is of the contra-angle type but it should be distinctly understood that my invention is not limited to any particular type. In F ig. l is shown a tool holder of the right-angle type. The holder is attached to the handpiece l0 in thel same manner as the hold-- er l1. A shaft 6l nts within the socket 30 in the spindle l5 and carries at its` outer end a star Wheel 62 meshing with the Wheel 63 on the sleeve (i4. The tool G5 is retained in the holder by a sliding member 66 co-rrespending to the member 46 in the previous embodiment. N oopening is provided in the end of the holder as the shaft 6l may be Withdrawn from the head 23 When the tool holder is removed. i

It should be clearly understood that the specific embodiments of my invention herein shown and described are for the purpose of illustrating the principlesof my invention and l ain aware that the form and arrangementof parts would necessarily be very different in dillerent types of operating pieces. l therefore reserve thn right to make all such changes therein as` fairly fall Within the scope of the following claims.

lv claim as my invention:

l. A dental operating piece comprising a substantially tubular casing having a bend therein intermediate its ends, a jointed nriving spindle extending longitudinally Within said casing, a tiansverse socket formed in said casing near its outer end, a tool holding sleeve revoluble Within said socket, i and means insertible through the outer end of said casing for operatively connecting said spindle and said sleeve.

2. A dental operating piece comprising a substantially tubular casing having a bend therein intermediate its ends and provided With an opening' at its outer end, a driving spindle extending longitudinally Within saidV casing, a transverse socket in said casing near said outer end. a tool holding sleeve revoluble Within said socket, means insertible through said opening for operatively con,- necting said spindle and said sleeve, and a vclosure for said opening.

3. A dental operating piece comprising aV substantially tubular casing having abend therein intermediate its ends and provided With an opening at its outer end, a driving spindle eiitendingv longitudinally Within said casing, a socket extending transversely through saidV casing near the outer end, a tool holding' sleeve revoluble YWithin said socket, means insertible through said opening for operatively connecting said spindle and said sleeve, and a latch adapted to re tain said sleeve in said'socket and form a closure for said opening'.

il. A. dental operating piece comprising a handpiece, a driving spindle revolubly mounted in said handpiece, an angle piece slidable over the outer end of said handpiece and provided with a bend intermediate its ends, a transverse socket in said angle piece near the outer end thereof, a revoluble tool holder in said socket, and driving mechanism extending` through said angle piece and operatively connecting` said spindle with said tool holder.

5. A dental operating piece comprising a handpiece, a driving spindle revolubly mounted in said handpiece` an angle piece slidable over the outer end of said handpiece and provided With a bend intermediate its ends, a latch tor attaching said angle piece to said handpieee, a transverse socket in said angle piece near the outer end thereof. a. revoluble tool holder in said socket, and shafting in said angle piece operativelyv connecting` said spindle with said tool holder.

G. An angle piece comprising a substantially tubular casing having a bend formed therein intermediate its ends, a transverse socket in said casing near the outer end thereof, a tool holding member revoluble Within said socket, and a latch .tor retaining said member in said socket and a tool in said member.

7. An angle piece comprising a substantially tubular casing, a transverse socket in said casing near the outer end thereof, a tool holding sleeve revoluble Within said socket, a latch slidable between guides on said holder to retain said sleeve in said socket and said tool in said sleeve, and means for actuating said sleeve.

8. An angle piece comprising a substantially tubular casing provided With a bend intermediate its ends and having a transverse socket near its outer end, a tool operating sleeve insertible into said socket from the rear end thereof, and a latch for retain ing said sleeve in said socket and a tool in said sleeve.

9. An angle piece comprising a substantially tubular casing, a transverse tool socket in the outer portion oi said casing, a tool operating sleeve iusertible into said socket from the rear end thereof, and a latch plate slidable between guides on said casing into a position to retain said sleeve in said socket and a tool in said sleeve.

l0. A dental operating piece comprising a substantially tubular casing, a driving spindle extending longitudinally within said casing, a transverse socket foi-med in said casing near its outer end, a tool holding sleeve revoluble within said socket, and means insertable through the outer end of said casing for operatively connecting said spindle and said sleeve.

11. A dental operating piece comprising a substantially tubular casing provided With an openin g at its outer end, a driving spindle extending longitudinally Within said casing, a transverse socket in said casing near said outer end, a tool holding sleeve revolulole Within said socket, means insertable through said opening Ator operatively connecting said spindle and said sleeve. and a closure for said opening.

l2. A dental operating piece comprising a substantially tubular casing provided with an opening at its outer end, a driving' spindle extending longitudinally Within said casing, a socket extending transversely through said casing near the outer end, a

4tool holding sleeve revolulole Within said socket, means insertable through said opening for operatively connecting said spindle and said sleeve, and a latch adapted to retain said sleeve in said socket and form a closure for said opening.

WILLIAM L. THIEDEMANN. 

